Draw the structure of a mammalian rRNA precursor, showing the locations of all three mature rRNA

Draw the structure of a mammalian rRNA precursor, showing...

Key Concepts

rRNA Processing

This refers to the series of cleavage and modification steps that convert the precursor rRNA into its mature, functional forms. It involves endonucleolytic cuts to remove spacer sequences, exonucleolytic trimming, and modifications such as methylation. The correct and timely processing of rRNA is essential for the production of functional ribosomes and, by extension, effective protein synthesis.

Internal and External Transcribed Spacers

These are non-coding regions found within the precursor rRNA that separate the sequences for the mature rRNAs. Internal transcribed spacers (ITS) separate the 18S, 5.8S, and 28S rRNA sequences, while the external transcribed spacers (ETS) are located at the 5' and 3' ends of the precursor. These spacer sequences are removed during the processing of the precursor rRNA.

Precursor rRNA

This is a long, initial transcript produced by RNA polymerase I that contains the sequences for multiple mature rRNA molecules as well as intervening spacer regions. In mammals, this precursor is typically the 45S rRNA, which includes sequences that will later become part of the 18S, 5.8S, and 28S rRNAs along with the external and internal transcribed spacers.

Mature rRNAs

These are the functional ribosomal RNA components that are incorporated into ribosomes. In mammalian cells, the precursor rRNA is processed to yield three main mature rRNAs: the 18S rRNA, which forms part of the small ribosomal subunit, and the 5.8S and 28S rRNAs, which, along with the 5S rRNA (transcribed separately), contribute to the large ribosomal subunit.

Transcript

00:01 So today we will discuss problem number 17 chapter number 24 and the topic says on the positions of the three rna species for the electrophoresis.

00:15 You know, the three rna species from cd and uc.

00:21 Actually, cd is the crohn's disease and uc is the ulcerative colitis, right? you just have to remember these two terms right so anyways these rna species from cd and uc individual exhibit and off diagonals right in this way in this position of diagonal position of these rna species was confirmed by longer general migration of several samples however in the figure b part you know this was selected since the three rna species were detected in the single gel right so two of these rnas were located in the region between you know 5s 5s and 5 .8 s right so you know 5 s and 5 .8 s right so you know 5 s and has actually 120 nucleotides i was supposed to write 120 right and this one has 159 nucleotides right containing the rna spots while the third of night of diagonal rna was located near the region of a 7 s rns spot you know which has 300 nucleotides right so, you know, recently, you know, it was reported at the detection of these three rnas in the intestinal tissue of individual with ibd, right? so according to a research which i started, they adopted a nomenclature system and referred to these species as rnax, right? right so rna xy and z right so you know respectively so other streaks below rnaz appeared off diagonal right so however these spans were only partially off diagonal and were detected from the minimum number of specimens and they did not undertake for the characterization of these rna species right so the detection result following the extraction of rnas with the acidified phenol procedure which is most efficient for the extraction of molecules smaller than you know 5 .8 r s which has 159 nucleotides this one you know and with the acid gronidium procedure are presented you know in the table which we will discuss in the next topic so rnax was detectable in only a small percentage of samples and only after acidified phenol extraction rna y was detected in a large proportion of both you know cd and uc so y was detected in both cd and uc right and whereas the x was detected in the small percentage percentage and was and the vibe was rejected in the large proportions both in the ecd and ucried and tissues regardless of the extraction procedure use so however rna virus detected in one inflammatory adeno you know carcinoma suggesting that it is associated with the inflammation right so rnaz was detected in almost all rna population, right? so from cd and uc tissues submitted to the sat5 phenol procedure, while it was only detected in half of both cd and uc tissues after total rna extraction...

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